Method of marking



Aug. 10, 1943. T; BARISH 2,326,604

METHOD OF MARKING Filed Sept. 2'7, 194].

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, v JrvuQ/vvhw THOMAS BARISH Patented Aug. 10, 1943 L" .1' T it atzacogi theea e fisr lleMsi ri i I Application September'Z'I, 1 941; Serial $044125 This invention relates; generally, to the'art of marking surfaces and, more particularly, provides anew andimproved method" of marking or symbols on asurf ace;

reproducingletters, numbers o'rotherforms or tra . line It has been'fo Other objects and features of novelty of the invention will be madeapparent by the following description and the annexed drawing, it being understood that such description and drawing are only illustrative of the invention and impose no limitationthereon not imposed by the appended claims,

Referring to the drawing, in which the same reference numeral referto corresponding parts,

Fig. 1 is a series'of views-showing the successive positions assumed by a tool in the shape of the letter I as it is moved in rotary transsurface at the end of the marking operation 11- lustrated in Figs. 1 and and Figs. 5 and 6 are diagrammatic views showing the positions assumed by the letter I as it is given movements other than rotary translatory movement in accordance with the invention.

Fig. 4 is a view taken on the line 44 of Fig. 3,

the shape offa letter, number ai s 1 Inthe practice at t inveihtion a tool is provided h isforin group of these, which is to be marked onfa sur face? This pre demeanoris aceto fac'e' ceetaet' men t e urrsee at 1 threoh' atwhich the-marking is d sired} letteifi then 'givn 'a tranlggtory ment fwhatse'eve'i f may 'beja "stra gh li siatoryinovenie asides i In l of the drawing are shown the" successive positions of the letter I in being marked 7 on a surfaceA by an application of my method employing rotary translatory movement. The original position of the letter is shown in full lines in each ofthe various parts of Fig.1,

While the successive positions assumed by the letter are shown in broken lines. In Fig. 2 are shown the various positions assumedby the'upper right-hand-corner of the letter, the se being marked by the numerals I to 5,inclusive. 'Each point of the letter moves in a similar circle, the

radius of which isfvery small with respect to the size of the letter and preferably is approximately five thousandths of an inch, or of the order j of that dimension. During themarking the letter is pressed toward-theplate and the process is continued until several hundred rotary translatory-movements have been made. An apparatus for use in causing such rotary translatory movement of the tool isshown in my'co-pending application Serial No. 412,639.

It will be apparent that the method may be 'carried'out by the use of movementsother than T rotary translatory movement. The tool maybe It is often necessary to mark letters, numbers The method provided by this invengiven a straight-line translatory movement in any direction or may be moved in translation along a curved path. In Fig. 5 there are shown in broken lines. the successive positionsthrough which the letter l passes when given; a straight line translatory movement in a directionjat right angles to its length, while in Fig. '6 the broken lines. show the .successive positions of the letter when given a straight-line translatory movement in the direction of its length. In

both Figs. 5 and 6 the original position of the letter is shown in full lines. In both cases, and

' 'e method according to} the 01, are i ance with the invention the movement is translatory in nature and thestroke of movement is very small with respectto the size of the marked tary translatory movement has been-used, thismarked letter "will be larger than. the tool used,

in all, directions, by an amountequal to the radius of the rotary translatory movement and willhave rounded corners, as shown 'in Fig. 3. If a straight-line translatory movement has been used' r 1 claim:

each marked letter will be larger than the mark ing letter, by an amount equal to the stroke 'of movement, in the direction of the tra'nslatory' movement. Each letter, number or other symbol,

or group of these, will be permanently marked on the surface bya depression worn thereinbylthe marking tool, as shownin 4, such depression being of the order of twenty-five tenthousandths ofaninchdeep. r i If the part to be marked is steel or other metal, I;have;found that a steel r-carborundum tool m be used; I aste l. t ol us d m kine asteel surface a lapping compound may be adto the marking of any particular kind of surface, it has been found to be particularly useful in marking very hard surfaces. However, because of the fact that very-low pressure is required be tween the marking tool and the surface being marked, the method is also very useful in marking fragile surfaces;

While I have described and illustrated certain series of stepsfor carrying my invention into vantageously used Nosuch. compound will be required if acarborundum toolis used.

The marking tool is preferably moved in ;trans-,

lation at a high speed in order to effect the marking quickly and to achievebest results. 'I have found that a speed of 3600 R. P. M., in rotary translation, or 3600 oscillations per minute, in

non-rotary translation, give good results but higher or lower speeds may beusedif desired.

While the invention is notlimitedin any. way

effect, it will be understood by those skilled in the art that other steps and methods may be practiced without departing in any way from the spirit or scope of the invention, for the limits of which reference must be had to the appended claims.

' 1. The method of marking on a fixed surface which consists in bringing into face-to-face enis very short withresbect to the size of the tool,

while maintaining the tool in substantially constant orientation with respectto the surface to thereby wear into the surfacea depression having substantiallythe size and form of the tool.

7 e method accordin to claimlinwhich the tool is given a straight-line. reciprocator'y movement. j'. 3. The method according to claim l,'in which the tool is so moved that eachpoint thereof repeatedly moves through 'a circular path thradius of which isveryshort withrespect' to the size of the tool.- o. g r'Ho asBARIsH; 

